Originally Posted by Haunty
I lost about 3mpg with the switch to winter gas I think, like night and day. Other than that, I haven't noticed any change in average mpg after almost 10,000 miles.
My mileage immediately dropped 3-4 mpg on the last fillup 3 weeks ago. Temperature and weather was the same before and after. Funny thing was, it was only a 6 gallon fillup, so most of the gas in the tank was the older gas. All brand-name gas. Curious.